Alarm Clock
An alarm clock feature in mobile apps involves creating a scheduled notification or action at a specific time, often used in productivity, health, or utility apps. It's built using:
Core Components
Time Picker UI
Allows users to select the alarm time. Often implemented with a TimePicker widget.
Alarm Manager / Scheduler
Used to schedule the alarm logic. Depends on platform:
Android: Alarm Manager, Work Manager, or Job Scheduler
iOS: UN User Notification Center or NS Timer (limited background capabilities)
Notifications
Displays alerts or sounds when the alarm goes off. Custom tones and snooze/dismiss actions are often added.
Persistent Storage
Alarm settings (time, repeat options, labels) are saved using local databases (e.g., SQLite, Room, or SharedPreferences).
Features
Repeating alarms (daily, weekly)
Custom sounds and labels
Snooze and dismiss options
Vibration or silent mode integration
Wake-up challenges or smart alarms (e.g., QR scan, math problem)
Technologies & Tools
Android (Java/Kotlin): Alarm Manager, Broadcast Receiver, Notification Manager
iOS (Swift): UN User Notification Center, Core Data, User Defaults
Cross-platform (Flutter, React Native): Use plugins like flutter_local_notifications, or platform channels for deeper integration
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